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H2 production by T. paralvinellae (filled symbols) and P. furiosus (open symbols) when grown on waste milk from cows treated with Ceftiofur (A) and from untreated cows (B). The concentrations of waste milk used were 10 (○, ●), 1 (Δ, ▲), and 0.1% (▽, ▼). Error bars represent the standard error.
